Cite Vaxenburg et al. in fluid force documentation.

PiperOrigin-RevId: 616114884
Change-Id: I0e7db61820c6ece118dee6871b8a526fdb79fb02

doc/computation/fluid.rst

@@ -85,8 +85,7 @@ Ellipsoid model
    :figwidth: 50%
    :align: right
 
-   The flight-capable Drosophila Melanogaster model in this figure will be described in a
-   forthcoming publication.
+   The flight-capable Drosophila Melanogaster model in this figure is described in :cite:t:`Vaxenburg2024`.
 
 
 In this section we describe and derive a stateless model of the forces exerted onto a moving rigid body by the
@@ -94,7 +93,6 @@ surrounding fluid, based on an ellipsoidal approximation of geom shape. This mod
 different types of fluid forces than the inertia-based model of the previous section. The motivating use-case for this
 model is insect flight, see figure on the right.
 
-
 Summary
 ~~~~~~~
 

doc/references.bib

@@ -88,3 +88,14 @@
   year={2015},
   publisher={Nature Publishing Group}
 }
+
+@article {Vaxenburg2024,
+  author = {Roman Vaxenburg and Igor Siwanowicz and Josh Merel and Alice A Robie and Carmen Morrow and Guido Novati and Zinovia Stefanidi and Gwyneth M Card and Michael B Reiser and Matthew M Botvinick and Kristin M Branson and Yuval Tassa and Srinivas C Turaga},
+  title = {Whole-body simulation of realistic fruit fly locomotion with deep reinforcement learning},
+  elocation-id = {2024.03.11.584515},
+  year = {2024},
+  doi = {10.1101/2024.03.11.584515},
+  publisher = {Cold Spring Harbor Laboratory},
+
+  journal = {bioRxiv}
+}